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PL0300 Datasheet(PDF) 9 Page - Power IC Ltd. |
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PL0300 Datasheet(HTML) 9 Page - Power IC Ltd. |
9 / 12 page OPERATION The PL0300/P is an ultra-low-noise, low-dropout, low- quiescent current linear regulator designed for space- restricted applications. It is available with preset output voltages ranging from 1.5V to 5.0V in 100mV increments. It can supply loads of up to 300mA. As shown in the Block Diagram, the PL0300/P consists of a highly accurate band gap core, noise bypass circuit, error amplifier, P-channel pass transistor and an internal feedback voltage divider. The PL0300/P allows for an adjustable output with an external feedback network. The 1.0V band gap reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. The output voltage is fed back through an internal resistor voltage-divider connected to the OUT pin. An external bypass capacitor connected to BYP (PL0300/P-BYP) reduces the noise at the output. Additional blocks include a current limiter, over temperature protection and shutdown logic. PL0300 Internal P-Channel Pass Transistor The PL0300/P features a 1 Ω (typical) P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including longer battery life. The P-channel MOSFET requires no base drive, which considerably reduces the quiescent current. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive current under heavy loads. The PL0300/P does not suffer from these problems and consumes only 90 μA of quiescent current. Current Limit The PL0300/P includes a current limiter. It monitors the output current and controls the pass transistor’s gate voltage to limit the output current under 550mA (typical). The output can be shorted to ground for an indefinite amount of time without damaging the part. The short circuit current limit is increased to approximately 650mA (typical) when the output voltage is within 10% of the nominal output, thus improving the performance of large pulsating loads. The in-regulation current limit option provides the user to overload the device, maintaining a continuous 300mA (RMS) load. Enable Input The PL0300/P features an active-high Enable input (EN) pin that allows on/off control of the regulator. The PL0300/P bias current reduces to ZERO (leakage current) when it goes into shutdown. The Enable input is TTL/CMOS compatible for simple logic interfacing. When EN is ‘H,’ the output voltage startup rising time is typically 25µs. Connect EN pin to IN pin for normal operation. Power Good Flag (Applicable for PL0300P) The PL0300/P features a Power Good flag (PGD), which monitors the output voltage and signals an error condition when the output voltage drops 10% below its nominal value. Under Voltage Lockout When the input supply goes too low (typically below 2.0V), the PL0300/P produces an internal UVLO (Under Voltage Lockout) signal that generates a fault signal and shuts down the chip. This mechanism protects the chip from producing false logic due to low input supply. July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 9 |
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